Preparation methods of 2,5-furandicarboxylic acid and 2,5-furanyl polyester

Abstract

The invention provides a preparation method of 2,5-furandicarboxylic acid. The preparation method comprises the following steps: A), with non-grain biomass as a raw material, preparing furfural; B), oxidizing the furfural to obtain furoic acid; C), performing an addition reaction on the furoic acid and carbon dioxide under the action of a catalyst to obtain the 2,5-furandicarboxylic acid, whereinthe catalyst is one or more of potassium carbonate, sodium oxalate, sodium nitrate, potassium nitrate, sodium nitrite, potassium nitrite, potassium acetate, sodium acetate, potassium formate, sodium formate, sodium hydrogen carbonate, potassium hydrogen carbonate, sodium hydroxide and potassium hydroxide. The furfural is prepared from the non-grain biomass as the raw material, so that the raw material cost is low; the furoic acid reacts with the carbon dioxide under the action of the specific catalyst to obtain the 2,5-furandicarboxylic acid; the catalyst is low in price; the used carbon dioxide is environment-friendly; by the preparation method, the yield is high.

Description

technical field [0001] The invention relates to the technical field of organic synthesis and polymer synthesis, in particular to a preparation method of 2,5-furandicarboxylic acid and 2,5-furyl polyester. Background technique [0002] 2,5-furandicarboxylic acid (FDCA), a member of the furan family, is abundant in sources and similar in structure to terephthalic acid (PTA), and is considered by academia and industry as a new type of renewable resource-based Diacid monomers and substitutes for terephthalic acid; considered by the U.S. Department of Energy as one of the 12 important chemicals for establishing a green chemical industry, and dubbed as one of the "sleeping giants" by DuPont and Dimans ; According to reports, the human body can produce 3-5mgFDCA every day. It can be polymerized with diols of different chain lengths and structures to obtain different 2,5-furandicarboxylic acid-based polyesters, such as polyethylene 2,5-furandicarboxylate (PEF), poly 2,5-furan 1,3-...

AI Technical Summary

Problems solved by technology

[0003] At present, the relatively mature preparation method of 2,5-furandicarboxylic acid uses 5-hydroxymethylfurfural (HMF) as the starting material, but HMF is unstable, difficult to store, easy to decompose or polymerize, and has cytotoxicity. Moreover, HMF is generally made from glucose or fructose, which occupies food resources and is still far away from industrial production.

The traditional method for preparing FDCA from furfural generally first oxidizes furfural to furoic acid, and then prepares FDCA by disproportionation or chloromethylation, which is not easy for industrial production, and the cost is too high. It is easy to generate isomers, and separation is difficult. Low yield and high environmental pollution

[0004] At the same time, the cost of furan-based polyester materials prepared by the above method is high, and carbohydrates are likely to remain in the FDCA raw materials, causing the color of polyester to deepen, and it is difficult to obtain high-molecular-weight polyester.